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Vulnerability record · CVE-2024-23832 · published 1 February 2024

CVE-2024-23832: Joinmastodon mastodon authentication bypass by spoofing vulnerability

Joinmastodon · Mastodon

Mastodon is a free, open-source social network server based on ActivityPub Mastodon allows configuration of LDAP for authentication. Due to insufficient origin validation in all Mastodon, attackers can impersonate and take over any remote account. Every Mastodon version prior to 3.5.17 is vulnerable, as well as 4.0.x versions prior to 4.0.13, 4.1.x version prior to 4.1.13, and 4.2.x versions prior to 4.2.5.

9.8 CVSS 3.1 Critical EPSS 2.5% · top 16.2% CWE-290 · Authentication bypass by spoofing
9.8CVSS 3.1 base score
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Mastodon is a free, open-source social network server based on ActivityPub Mastodon allows configuration of LDAP for authentication. Due to insufficient origin validation in all Mastodon, attackers can impersonate and take over any remote account. Every Mastodon version prior to 3.5.17 is vulnerable, as well as 4.0.x versions prior to 4.0.13, 4.1.x version prior to 4.1.13, and 4.2.x versions prior to 4.2.5.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2024/02/02/4 Mailing ListPatch
https://github.com/mastodon/mastodon/commit/1726085db5cd73dd30953da858f9887bcc90b958 Patch
https://github.com/mastodon/mastodon/security/advisories/GHSA-3fjr-858r-92rw Vendor Advisory
http://www.openwall.com/lists/oss-security/2024/02/02/4 Mailing ListPatch
https://github.com/mastodon/mastodon/commit/1726085db5cd73dd30953da858f9887bcc90b958 Patch
https://github.com/mastodon/mastodon/security/advisories/GHSA-3fjr-858r-92rw Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-23832), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.